In addition to the four teams that began the service late last season (New York Mets, Boston Red Sox, San Francisco Giants and Kansas City Royals), the new teams signing on will include the Baltimore Orioles, Chicago Cubs, Detroit Tigers, Milwaukee Brewers, Minnesota Twins, Oakland Athletics and Pittsburgh Pirates. No Yankees on this list - yet.

Last week, MLB introduced its 2013 At Bat application, popular with both iOS and Google's(GOOG) Android users. The free version of the software is increasingly preferred by Android fans while iPhone baseball lovers are much more willing to shell out the $20 per season for premium content.